1f 800880 = 8 x 10x + 8 x 10y + 8 x 10z where x, y and z are whole numbers, then the value of x + y + z is
6
5
11
8
Four traffic lights give red signals after 30 sec, 45 sec, 60 sec and 120 sec respectively. If all the traffic lights began at the same time, then all of them will give red signal at the same time in
180s
120s
300s
360s
The values of y for which the 4-digit number 51y3 is divisible by 9 is
2 or 3
0 or 9
0 or 3
3 or 9